GMCustomerService Posted April 13, 2014 Posted April 13, 2014 Hello benielsahn, I understand that you are looking for advice to resolve this issue. I might not be able to provide you any technical support but I would be happy to look into this concern for you. Please private message me referencing this thread if I can be of any assistance. Jennifer T. GM Customer Care
gmtech4 Posted April 14, 2014 Posted April 14, 2014 Bring this one back from the dead This is exactly what I am experiencing. 2013 1500 Z71 5.3 with 16k. Started noticing around 8k Any updates? are you taking it in for a warranty claim ?
Lawrence D Weaver Posted February 11, 2020 Posted February 11, 2020 I have a 2000 GMC Sierra 2500 with a 6.0L that hisses also. The hiss occurs very randomly and sounds as if it's in the engine bay. Clueless
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